Can/should I do fasted cardio (exercise first thing in the morning before eating)?
Fasted cardio is a great option for those who can get in a high intensity workout in the morning before breakfast. The fasted cardio theory is that when you wake up, stored glucose in the liver (i.e., glycogen) is low, and you will more-readily use your fat stores for energy. Thus, working out before a meal will help you burn more calories from fat. In addition, working out on an empty stomach can prevent digestion problems that may arise when exercising with a full stomach. However, fasted exercise is not for everyone. If you often feel sick or dizzy when trying to do fasted exercise or cannot get in a high intensity workout, we recommend exercising at a time when you feel your best.